"Thor is the foremost of them, he that is called Thor of the Æsir, or Öku-Thor; he is strongest of all the gods and men... Thor has two he-goats, that are called Tooth-Gnasher and Tooth-Gritter, and a chariot wherein he drives, and the he-goats draw the chariot; therefore is he called Öku-Thor."

– Gylfaginning, Arthur Gilchrist Brodeur Translation